Windows 2012 Hosting - MVC 6 and SQL 2014 BLOG

Tutorial and Articles about Windows Hosting, SQL Hosting, MVC Hosting, and Silverlight Hosting

ASP.NET MVC 4 Hosting - ASPHostPortal :: Getting WebApi and Areas to play nicely ASP.NET MVC 4

clock January 21, 2013 07:08 by author Jervis

In this blog, I discuss these limitations and present a possible solution.

Background

The WebApi and Areas features play an important role in the project I am currently working on. In this project, a web application is developed for multiple types of end-users. Areas are used to create separate frontends for each type of end-user. WebApi is used as part of an interaction framework (knockoutjs) that enriches the user experience. Below is a list of relevant design decisions that were made:

- The main MVC application resides in the root of the solution.
- All administrator functionality resides in a separate area.
- Each external party has its own area.
- Each area, including the root, constitutes a well separated functional block. Functionality from one area may not be exposed to another area. This is to prevent unauthorized access of data.
- Each area, including the root, has its own RESTfull API (WebApi).

During the development of this web application, I encountered an important limitation of WebApi when used in conjunction with Areas.

Routing and WebApi

Both regular and WebApi calls use ASP.NET MVC’s routing mechanism to translate HTTP requests to the appropriate controller action. However, only regular calls support areas, while WebApi calls are “arealess”. As a result, WebApi controllers in different areas are actually accessible from all areas. Additionally, having multiple WebApi controllers with identical names in different areas will produce an exception:

Multiple types were found that match the controller named ‘clients’. This can happen if the route that services this request (‘api/{controller}/{id}’) found multiple controllers defined with the same name but differing namespaces, which is not supported.

The request for ‘clients’ has found the following matching controllers:
MvcApplication.Areas.Administration.Controllers.Api.ClientsController
MvcApplication.Controllers.Api.ClientsController

The error message pretty much sums up the problem: ASP.NET MVC 4 RC does not support the partitioning of WebApi controllers across areas.

IHttpControllerSelector

The culprit is the DefaultHttpControllerSelector which is ASP.NET MVC’s default implementation of the IHttpControllerSelector interface. This class is responsible for selecting the appropriate IHttpController (the interface implemented by ApiController), when provided with a HTTP request message. At the heart of the DefaultHttpControllerSelector lies the HttpControllerTypeCache. This class runs through all assemblies that are used by the application and caches all types that implement the IHttpController. The SelectController method of the DefaultHttpControllerSelector uses this cache to lookup a matching type for the given controller name. This operation can end in three different manners:

- No matching types were found, which results in an HttpStatus.NotFound (404).
- One matching type was found, which is returned by the method and ASP.NET MVC continues to process the request.
- Multiple matches were found, which results in an exception similar to one displayed earlier.

In search for a solution

Fortunately, through the power of Inversion of Control, developers can inject their own implementation of IHttpControllerSelector. In a related blog by Andrew Malkov, he attempts to tackle the problem by creating a custom implementation called AreaHttpControllerSelector.

This class allows area specific WebApi controllers to co-exist, provided one makes a minor modification to the WebApi routes. In order to function, a default route parameter called “area” must be added to the HttpRoute definition in the AreaRegistration file.

1              context.Routes.MapHttpRoute(
2                  name: "Administration_DefaultApi",
3                  routeTemplate: "Administration/api/{controller}/{id}",
4                  defaults: new { area = "Administration", id = RouteParameter.Optional }
5              );

Unfortunately, adding this extra parameter introduces a new limitation: Querystring parameters on WebApi calls no longer function. E.g. GET /Administration/api/clients will work, but GET /Administration/api/clients?firstname=john will result in a 404.

Part of the problem lies in the manner in which AreaRegistration is used to define routes. Consider the AdministrationAreaRegistration below:

1              public class AdministrationAreaRegistration : AreaRegistration
2              {
3                  public override string AreaName
4                  {
5                      get
6                      {
7                          return "Administration";
8                      }
9                  }
10          
11               public override void RegisterArea(AreaRegistrationContext context)
12               {
13                   context.Routes.MapHttpRoute(
14                       name: "Administration_DefaultApi",
15                       routeTemplate: "Administration/api/{controller}/{id}",
16                       defaults: new { id = RouteParameter.Optional }
17                   );
18          
19                   context.MapRoute(
20                       "Administration_default",
21                       "Administration/{controller}/{action}/{id}",
22                       new { action = "Index", id = UrlParameter.Optional }
23                   );
24               }
25           }

The first route defines how ApiContollers can be reached, while the second route defines how regular controllers can be reached. Both registrations use a different method for registering the route in order to differentiate between normal calls and WebApi calls. Routes registered through MapHttpRoute are meant for WebApi controllers while routes registered through MapRoute are meant for regular controllers.

Note that MapHttpRoute is called on the Routes collection, whereas MapRoute is called on the AreaRegistrationContext itself. This implies that there is a difference between the default MapRoute and the one provided by the AreaRegistrationContext.

After digging through the sourcecode of ASP.NET MVC, I found that the most notable difference is that the MapRoute of AreaRegistrationContext incorporates the AreaName into the route’s metadata. Specifically, the value of the AreaName property is added to the route’s DataTokens.

Solution – Part 1

I created a MapHttpRoute extension method for the AreaRegistrationContext that performed a similar operation as the AreaRegistrationContext.MapRoute method.

1              public static class AreaRegistrationContextExtensions
2              {
3                  public static Route MapHttpRoute(this AreaRegistrationContext context, string name, string routeTemplate)
4                  {
5                      return context.MapHttpRoute(name, routeTemplate, null, null);
6                  }
7             
8                  public static Route MapHttpRoute(this AreaRegistrationContext context, string name, string routeTemplate, object defaults)
9                  {
10                   return context.MapHttpRoute(name, routeTemplate, defaults, null);
11               }
12          
13               public static Route MapHttpRoute(this AreaRegistrationContext context, string name, string routeTemplate, object defaults, object constraints)
14               {
15                   var route = context.Routes.MapHttpRoute(name, routeTemplate, defaults, constraints);
16                   if (route.DataTokens == null)
17                   {
18                       route.DataTokens = new RouteValueDictionary();
19                   }
20                   route.DataTokens.Add("area", context.AreaName);
21                   return route;
22               }
23           }

To use the new extension method, remove the Routes property from the call chain:

1              context.MapHttpRoute(
2                name: "Administration_DefaultApi",
3                routeTemplate: "Administration/api/{controller}/{id}",
4                defaults: new { id = RouteParameter.Optional }
5              );

Now both the regular routes and the WebApi routes have knowledge of their corresponding area.

Solution – Part 2

The second part of the solution is to create an implementation of IHttpControllerSelector that actually uses the area name. I took the AreaHttpControllerSelector class from Andrew Malkov’s blog post and used it as a base for my own solution.

1              namespace MvcApplication.Infrastructure.Dispatcher
2              {
3                  using System;
4                  using System.Collections.Concurrent;
5                  using System.Collections.Generic;
6                  using System.Globalization;
7                  using System.Linq;
8                  using System.Net.Http;
9                  using System.Web.Http;
10               using System.Web.Http.Controllers;
11               using System.Web.Http.Dispatcher;
12          
13               public class AreaHttpControllerSelector : DefaultHttpControllerSelector
14               {
15                   private const string AreaRouteVariableName = "area";
16          
17                   private readonly HttpConfiguration _configuration;
18                   private readonly Lazy<ConcurrentDictionary<string, Type>> _apiControllerTypes;
19          
20                   public AreaHttpControllerSelector(HttpConfiguration configuration)
21                       : base(configuration)
22                   {
23                       _configuration = configuration;
24                       _apiControllerTypes = new Lazy<ConcurrentDictionary<string,
Type>>(GetControllerTypes);
25                   }
26          
27                   public override HttpControllerDescriptor SelectController(HttpRequestMessage request)
28                   {
29                       return this.GetApiController(request);
30                   }
31          
32                   private static string GetAreaName(HttpRequestMessage request)
33                   {
34                       var data = request.GetRouteData();
35                       if (data.Route.DataTokens == null)
36                       {
37                           return null;
38                       }
39                       else
40                       {
41                           object areaName;
42                           return data.Route.DataTokens.TryGetValue(AreaRouteVariableName, out areaName) ? areaName.ToString() : null;
43                       }
44                   }
45          
46                   private static ConcurrentDictionary<string, Type> GetControllerTypes()
47                   {
48                       var assemblies = AppDomain.CurrentDomain.GetAssemblies();
49          
50                       var types = assemblies
51                           .SelectMany(a => a
52                               .GetTypes().Where(t =>
53                                   !t.IsAbstract &&
54                                   t.Name.EndsWith(ControllerSuffix, StringComparison.OrdinalIgnoreCase) &&
55                                   typeof(IHttpController).IsAssignableFrom(t)))
56                           .ToDictionary(t => t.FullName, t => t);
57          
58                       return new ConcurrentDictionary<string, Type>(types);
59                   }
60          
61                   private HttpControllerDescriptor GetApiController(HttpRequestMessage request)
62                   {
63                       var areaName = GetAreaName(request);
64                       var controllerName = GetControllerName(request);
65                       var type = GetControllerType(areaName, controllerName);
66          
67                       return new HttpControllerDescriptor(_configuration, controllerName, type);
68                   }
69          
70                   private Type GetControllerType(string areaName, string controllerName)
71                   {
72                       var query = _apiControllerTypes.Value.AsEnumerable();
73          
74                       if (string.IsNullOrEmpty(areaName))
75                       {
76                           query = query.WithoutAreaName();
77                       }
78                       else
79                       {
80                           query = query.ByAreaName(areaName);
81                       }
82          
83                       return query
84                           .ByControllerName(controllerName)
85                           .Select(x => x.Value)
86                           .Single();
87                   }
88               }
89          
90               public static class ControllerTypeSpecifications
91               {
92                   public static IEnumerable<KeyValuePair<string, Type>> ByAreaName(this IEnumerable<KeyValuePair<string, Type>> query, string areaName)
93                   {
94                       var areaNameToFind = string.Format(CultureInfo.InvariantCulture, ".{0}.", areaName);
95          
96                       return query.Where(x => x.Key.IndexOf(areaNameToFind, StringComparison.OrdinalIgnoreCase) != -1);
97                   }
98          
99                   public static IEnumerable<KeyValuePair<string, Type>> WithoutAreaName(this IEnumerable<KeyValuePair<string, Type>> query)
100                 {
101                     return query.Where(x => x.Key.IndexOf(".areas.", StringComparison.OrdinalIgnoreCase) == -1);
102                 }
103        
104                 public static IEnumerable<KeyValuePair<string, Type>> ByControllerName(this IEnumerable<KeyValuePair<string, Type>> query, string controllerName)
105                 {
106                     var controllerNameToFind = string.Format(CultureInfo.InvariantCulture, ".{0}{1}", controllerName, AreaHttpControllerSelector.ControllerSuffix);
107        
108                     return query.Where(x => x.Key.EndsWith(controllerNameToFind, StringComparison.OrdinalIgnoreCase));
109                 }
110             }
111         }

If you want to learn more about the technical details of the solution, I suggest you read Andrew’s excellent blog post first. The most significant modifications are:

Changed the GetAreaName method in order to retrieve the area name from the DataTokens property rather than the RouteData.

Added support for “arealess” WebApi controllers (e.g. those that reside in the root) to the GetControllerType method.

Removed the fallback mechanism from the SelectController method. The original implementation would call the SelectController method of the base-class in case GetControllerType failed to produce a result. I preferred an approach where the responsibility of successful controller selection resided in AreaHttpControllerSelector.

Finally, to inject the new AreaHttpControllerSelector class, the following line must be added to the Application_Start method in the Global.asax.cs

1              GlobalConfiguration.Configuration.Services.Replace(typeof(IHttpControllerSelector), new AreaHttpControllerSelector(GlobalConfiguration.Configuration));

After these modifications everything worked as expected!

 



ASP.NET MVC 4 Hosting - ASPHostPortal :: Implementing custom XmlMediaTypeFormatter that ignores XML namespaces

clock December 21, 2012 10:25 by author Jervis

In this blog post I will show how to implement a custom XmlMediaTypeFormatter that extends the default ASP.NET Web API XmlMediaTypeFormatter in a way that it ignores XML namespaces when parsing xml messages.

By default the ASP.NET Web API XmlMediaTypeFormatter is not able to parse XML requests that contain any XML namespace declarations. If you would like to support clients, that (for any reason) send messages containing XML namespaces you can use the IgnoreNamespacesXmlMediaTypeFormatter that is defined as follows:

public class IgnoreNamespacesXmlMediaTypeFormatter : XmlMediaTypeFormatter
{
  // See http://wiki.tei-c.org/index.php/Remove-Namespaces.xsl
  private const string NamespaceRemover =
    @"<xsl:stylesheet version='1.0' xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
        <xsl:output method='xml' indent='no'/>
        <xsl:template match='/|comment()|processing-instruction()'>
          <xsl:copy>
            <xsl:apply-templates/>
          </xsl:copy>
        </xsl:template>
        <xsl:template match='*'>
          <xsl:element name='{local-name()}'>
            <xsl:apply-templates select='@*|node()'/>
          </xsl:element>
        </xsl:template>
        <xsl:template match='@*'>
          <xsl:attribute name='{local-name()}'>
            <xsl:value-of select='.'/>
          </xsl:attribute>
        </xsl:template>
      </xsl:stylesheet>";

  private readonly XslCompiledTransform _xlstTransformer;

  public IgnoreNamespacesXmlMediaTypeFormatter()
  {
    var xslt = XDocument.Parse(NamespaceRemover, LoadOptions.PreserveWhitespace);
    _xlstTransformer = new XslCompiledTransform();
    _xlstTransformer.Load(xslt.CreateReader(), new XsltSettings(), new XmlUrlResolver());
  }

  public override Task<object> ReadFromStreamAsync(Type type, Stream stream, HttpContentHeaders contentHeaders, IFormatterLogger formatterLogger)
  {
    try
    {
      // Read XML
      var xmlDocument = XDocument.Load(new XmlTextReader(stream));

      // Transform XML
      var resultStream = new MemoryStream();
      _xlstTransformer.Transform(xmlDocument.CreateReader(), XmlWriter.Create(resultStream, new XmlWriterSettings() { OmitXmlDeclaration = true }));
      resultStream.Position = 0;

      // Process request with XmlMediaTypeFormatter default functionality
      return base.ReadFromStreamAsync(type, resultStream, contentHeaders, formatterLogger);
    }
    catch (XmlException)
    {
      return base.ReadFromStreamAsync(type, stream, contentHeaders, formatterLogger);
    }
  }
}

In detail the IgnoreNamespacesXmlMediaTypeFormatter removes the XML namespace declarations from the XML message and passes the modified XML to the base class to use the default XmlMediaTypeFormatter functionality. Removing the XML namespaces is done with a XSLT transformation (see http://wiki.tei-c.org/index.php/Remove-Namespaces.xsl)

To activate the IgnoreNamespacesXmlMediaTypeFormatter add the following lines in the file Global.asax.cs:

protected void Application_Start()
{
  [...]
  // Remove default XmlFormatter and add (customized) IgnoreNamespacesXmlMediaTypeFormatter GlobalConfiguration.Configuration.Formatters.Remove(GlobalConfiguration.Configuration.Formatters.XmlFormatter);
  var ignoreNamespacesXmlMediaTypeFormatter = new IgnoreNamespacesXmlMediaTypeFormatter{ UseXmlSerializer = true };

GlobalConfiguration.Configuration.Formatters.Add(ignoreNamespacesXmlMediaTypeFormatter);
  [...]
}



ASP.NET MVC 4 Hosting - ASPHostPortal :: How to Fix - Could not load type 'System.Web.WebPages.DisplayModes' from assembly 'System.Web.WebPages, Version=2.0.0.0

clock October 24, 2012 08:28 by author Jervis

This is an error message that sometimes you will see when you run your ASP.NET MVC 4.

Could not load type 'System.Web.WebPages.DisplayModes' from assembly 'System.Web.WebPages, Version=2.0.0.0

So, today I will discuss how to fix it on your shared hosting environment. The basic problem is that there is a mixup between MVC 4 Developer Preview and MVC 4 Beta .dlls in the project. To see which version you have right click the .dll file in Windows Explorer and choose Properties->Details. Look for
  'File Version' :

- MVC 4 Developer Preview is version 4.0.10906.0

- MVC 4 Beta is version 4.0.20126.16343

Make sure all says the MVC 4 beta version number (replace the .dlls from a fresh MVC 4 Beta project if necessary) for these files:


- System.Web.Mvc

- System.Web.WebPages
- System.Web.Razor
- System.Web.WebPages.Deployment
- System.Web.WebPages.Razor

Then please kindly retry and it will work fine.
J

If you have problem with your current host and you need to run your ASP.NET MVC 4, please check our site at
http://www.asphostportal.com. You can  start from our HOST ZERO plan.

Reasons why you must trust ASPHostPortal.com

Every provider will tell you how they treat their support, uptime, expertise, guarantees, etc., are. Take a close look. What they’re really offering you is nothing close to what
ASPHostPortal does. You will be treated with respect and provided the courtesy and service you would expect from a world-class web hosting business.

You’ll have highly trained, skilled professional technical support people ready, willing, and wanting to help you 24 hours a day. Your web hosting account servers are monitored from three monitoring points, with two alert points, every minute, 24 hours a day, 7 days a week, 365 days a year. The followings are the list of other added- benefits you can find when hosting with us:


-
DELL Hardware
Dell hardware is engineered to keep critical enterprise applications running around the clock with clustered solutions fully tested and certified by Dell and other leading operating system and application providers.
- Recovery Systems
Recovery becomes easy and seamless with our fully managed backup services. We monitor your server to ensure your data is properly backed up and recoverable so when the time comes, you can easily repair or recover your data.

- Control Panel
We provide one of the most comprehensive customer control panels available. Providing maximum control and ease of use, our Control Panel serves as the central management point for your ASPHostPortal account. You’ll use a flexible, powerful hosting control panel that will give you direct control over your web hosting account. Our control panel and systems configuration is fully automated and this means your settings are configured automatically and instantly.

- Excellent Expertise in Technology
The reason we can provide you with a great amount of power, flexibility, and simplicity at such a discounted price is due to incredible efficiencies within our business. We have not just been providing hosting for many clients for years, we have also been researching, developing, and innovating every aspect of our operations, systems, procedures, strategy, management, and teams. Our operations are based on a continual improvement program where we review thousands of systems, operational and management metrics in real-time, to fine-tune every aspect of our operation and activities. We continually train and retrain all people in our teams. We provide all people in our teams with the time, space, and inspiration to research, understand, and explore the Internet in search of greater knowledge. We do this while providing you with the best hosting services for the lowest possible price.

- Data Center

ASPHostPortal modular Tier-3 data center was specifically designed to be a world-class web hosting facility totally dedicated to uncompromised performance and security
- Monitoring Services
From the moment your server is connected to our network it is monitored for connectivity, disk, memory and CPU utilization – as well as hardware failures. Our engineers are alerted to potential issues before they become critical.

- Network
ASPHostPortal has architected its network like no other hosting company. Every facet of our network infrastructure scales to gigabit speeds with no single point of failure.

- Security
Network security and the security of your server are ASPHostPortal’s top priorities. Our security team is constantly monitoring the entire network for unusual or suspicious behavior so that when it is detected we can address the issue before our network or your server is affected.

- Support Services
Engineers staff our data center 24 hours a day, 7 days a week, 365 days a year to manage the network infrastructure and oversee top-of-the-line servers that host our clients’ critical sites and services.

 



ASP.NET MVC Hosting - ASPHostPortal :: ASP.NET MVC 4 Preview Released

clock October 10, 2011 06:14 by author Jervis

Woww… Amazing, I am just downloaded ASP.NET MVC preview 4 and I have just created a sample application. It has been integrated with ASP .NET memberships authentication. So you need to have that database schema installed on your SQL Server in order to run the application. So before running make sure that you have this schema installed. Also make appropriate changes to your web.config file.

The connection string is setup in a way that at first operation if you have aspnetdb.mdf file in your system it will install membership schema on your own. The application has login/register and forget password features implemented. I am attaching screen shot of the application that was created by default.

1. Startup Page (default)



2. Login Page



3. Register Page



C’mon. Download it and you can try this new product. And we will launched our new ASP.NET MVC 4 soon. If you need hosting with an affordable price, just visit our site and get your journey with us. J

Reasons why you must trust ASPHostPortal.com

Every provider will tell you how they treat their support, uptime, expertise, guarantees, etc., are. Take a close look. What they’re really offering you is nothing close to what ASPHostPortal does. You will be treated with respect and provided the courtesy and service you would expect from a world-class web hosting business.

You’ll have highly trained, skilled professional technical support people ready, willing, and wanting to help you 24 hours a day. Your web hosting account servers are monitored from three monitoring points, with two alert points, every minute, 24 hours a day, 7 days a week, 365 days a year. The followings are the list of other added- benefits you can find when hosting with us:

-
DELL Hardware
Dell hardware is engineered to keep critical enterprise applications running around the clock with clustered solutions fully tested and certified by Dell and other leading operating system and application providers.
- Recovery Systems
Recovery becomes easy and seamless with our fully managed backup services. We monitor your server to ensure your data is properly backed up and recoverable so when the time comes, you can easily repair or recover your data.
- Control Panel
We provide one of the most comprehensive customer control panels available. Providing maximum control and ease of use, our Control Panel serves as the central management point for your ASPHostPortal account. You’ll use a flexible, powerful hosting control panel that will give you direct control over your web hosting account. Our control panel and systems configuration is fully automated and this means your settings are configured automatically and instantly.
- Excellent Expertise in Technology
The reason we can provide you with a great amount of power, flexibility, and simplicity at such a discounted price is due to incredible efficiencies within our business. We have not just been providing hosting for many clients for years, we have also been researching, developing, and innovating every aspect of our operations, systems, procedures, strategy, management, and teams. Our operations are based on a continual improvement program where we review thousands of systems, operational and management metrics in real-time, to fine-tune every aspect of our operation and activities. We continually train and retrain all people in our teams. We provide all people in our teams with the time, space, and inspiration to research, understand, and explore the Internet in search of greater knowledge. We do this while providing you with the best hosting services for the lowest possible price.
- Data Center
ASPHostPortal modular Tier-3 data center was specifically designed to be a world-class web hosting facility totally dedicated to uncompromised performance and security
- Monitoring Services
From the moment your server is connected to our network it is monitored for connectivity, disk, memory and CPU utilization – as well as hardware failures. Our engineers are alerted to potential issues before they become critical.
- Network
ASPHostPortal has architected its network like no other hosting company. Every facet of our network infrastructure scales to gigabit speeds with no single point of failure.
- Security
Network security and the security of your server are ASPHostPortal’s top priorities. Our security team is constantly monitoring the entire network for unusual or suspicious behavior so that when it is detected we can address the issue before our network or your server is affected.
- Support Services
Engineers staff our data center 24 hours a day, 7 days a week, 365 days a year to manage the network infrastructure and oversee top-of-the-line servers that host our clients’ critical sites and services.



About ASPHostPortal.com

We’re a company that works differently to most. Value is what we output and help our customers achieve, not how much money we put in the bank. It’s not because we are altruistic. It’s based on an even simpler principle. "Do good things, and good things will come to you".

Success for us is something that is continually experienced, not something that is reached. For us it is all about the experience – more than the journey. Life is a continual experience. We see the Internet as being an incredible amplifier to the experience of life for all of us. It can help humanity come together to explode in knowledge exploration and discussion. It is continual enlightenment of new ideas, experiences, and passions


Author Link


Corporate Address (Location)

ASPHostPortal
170 W 56th Street, Suite 121
New York, NY 10019
United States

Sign in